Re: [heycam/webidl] iterable's should have more than just forEach() (#561)

IMO if you want an array, you should not be using `iterable<>`. You should be using an array. `iterable<>` is when you need to create some completely custom collection, e.g. `DOMTokenList` (a type of set), `URLSearchParams` (a multi-map), or when you need to adapt legacy array-likes.

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